Fast path (when the remaining bytes are sufficient)
()
| 1175 | |
| 1176 | // Fast path (when the remaining bytes are sufficient) |
| 1177 | func (b *ByteBuffer) readVarUint64Fast() uint64 { |
| 1178 | // Single instruction load using unsafe pointer cast (little-endian only) |
| 1179 | var bulk uint64 |
| 1180 | if isLittleEndian { |
| 1181 | bulk = *(*uint64)(unsafe.Pointer(&b.data[b.readerIndex])) |
| 1182 | } else { |
| 1183 | bulk = binary.LittleEndian.Uint64(b.data[b.readerIndex:]) |
| 1184 | } |
| 1185 | |
| 1186 | result := bulk & 0x7F |
| 1187 | readLength := 1 |
| 1188 | |
| 1189 | if (bulk & 0x80) != 0 { |
| 1190 | result |= (bulk >> 1) & 0x3F80 |
| 1191 | readLength = 2 |
| 1192 | if (bulk & 0x8000) != 0 { |
| 1193 | result |= (bulk >> 2) & 0x1FC000 |
| 1194 | readLength = 3 |
| 1195 | if (bulk & 0x800000) != 0 { |
| 1196 | result |= (bulk >> 3) & 0xFE00000 |
| 1197 | readLength = 4 |
| 1198 | if (bulk & 0x80000000) != 0 { |
| 1199 | result |= (bulk >> 4) & 0x7F0000000 |
| 1200 | readLength = 5 |
| 1201 | if (bulk & 0x8000000000) != 0 { |
| 1202 | result |= (bulk >> 5) & 0x3F800000000 |
| 1203 | readLength = 6 |
| 1204 | if (bulk & 0x800000000000) != 0 { |
| 1205 | result |= (bulk >> 6) & 0x1FC0000000000 |
| 1206 | readLength = 7 |
| 1207 | if (bulk & 0x80000000000000) != 0 { |
| 1208 | result |= (bulk >> 7) & 0xFE000000000000 |
| 1209 | readLength = 8 |
| 1210 | if (bulk & 0x8000000000000000) != 0 { |
| 1211 | // Need 9th byte (full 8 bits) |
| 1212 | b9 := b.data[b.readerIndex+8] |
| 1213 | result |= uint64(b9) << 56 |
| 1214 | readLength = 9 |
| 1215 | } |
| 1216 | } |
| 1217 | } |
| 1218 | } |
| 1219 | } |
| 1220 | } |
| 1221 | } |
| 1222 | } |
| 1223 | b.readerIndex += readLength |
| 1224 | return result |
| 1225 | } |
| 1226 | |
| 1227 | // Slow path (read byte by byte) |
| 1228 | func (b *ByteBuffer) readVarUint64Slow(err *Error) uint64 { |
no test coverage detected